Sash pulley



April 29, 1930. H. F. PETERSON ET AL SASH PULLEY Filed Feb. 29, 1928 Patented Apr. '29, 1930 @PAT ljorifice HARRY F.PETERSON, OF BAYTOWN, AND CLARENCE P. BIRD, OFBAYPORT, MINNESOTA,

ASSIGNORS, BYMESNE ASSIGNMENTS, TO ANDERSON FOUNDRY COMPANY, OF'BAY- PORT, MINNESOTA, A1 CORPORATION 0F llVlIIlINESOCll-l SASI-I PULLEY vApplication"filed February 29, 1928. SeralN'o. 258,080.

Our invention relates'to a window sash pulley and particularly to the bearing therefor, to the end that it will be substantially noiseless during the operation of raising or lowering the window sash, and will valso be of such construction that it will be extremely durable and adapted particularly for the purpose designed.

The primary object of this invention is to provide means whereby a fibrous bushing forming the core of the pulley may be allowed to expand through exposure to moisture or weather conditions, and still during such expansion turn freely on its axis or supv porting pin.

A further object is to provide a sash pulley of very simple construction, and one that can be manufactured and sold at a comparatively small cost.

Other objects of the invention will appear from the following detailed description.

In the accompanying drawing forming part of this specication,

Figure l is a sectional view through a pulley and its housing embodying our invention and taken on a section line 1-1 of Figure 2;

Figure 2 is a sectional view taken on section line 2 2 of Figure l;

Figure 3 is a detailed sectional view ofthe sheave removed from the housing; and

Figure 4 is a detailed View of the hub of.y the sheave showing the orifice centrally ar-y ranged therein.

In the drawing, 2 represents the housing or casing of the pulley adapted to fit into the recess in the window jamb, as usual in devices of this kind, and having the usual flanges 3 by means of which the housing is secured. The sheave which we prefer to use in this housing is preferably of cast metal and comprises a hub 4 having a peripheral flange 5 terminating in flaring walls 6 between which a seat 7 is formed for the sash cord, as usual in devices of this kind. The hub 4 has a bore or orifice 8 extending therethrough and preferably this orifice is rectangular in form as shown in the drawing, provided with four walls which bound the orifice, but the number of these walls may be increased or decreased as preferred and still be Within the scope of the invention. For convenience in this case we have used the lrectangular construction' cas shown within the orifice'and preferablyabout midway between the ends of ythe hub we provide a recess 9 formed in the c 55 yof the orifice on each side of the recess will,

as indicated inFigurei', preferably 4come to a'rather sharp edge or shoulder and withinl the orificewe `arrange a bushing'lO," preferably of suitable fibrous material that is adapted to be and preferably is impregnated with a lubricatingiagent. The pores of the" iibrous material become filled 'with'this'lubri'cant so J70 that the bushing will atallv timeshave al substantially anti-friction bearingon'thepin or axis of the'pulley sheave and insure freedom i offrevolution of the* sheave' without noise and `wlthv'a lminimum of wear. The moisture 'to aA ing the recess in the inner wall'of thesheave hub, yweprovide for 1 freedom of outward movement of thebushing during expansion,

the swelling. ofthe wood' following naturally ythe direction lof least resistance, and'V the re- 190 cess is of sufficient widthfand depth to allow the bushing to rswell l`outwardly and bear firmly against the `inner surface of the sheave hub, and at thevsame time, turn freely on the axle or supporting pin of the sheave. This swelling or expansion of the bushing will-also lock it in the'hub and positively prevent longitudinal movementy and 'any possibility of the lannoying clicking Ametallic sound which results from the @Dateci '0f y,Illetal uponfmetall y The ends of the bushing protrude beyond the sorbing or having its pores impregnated with a lubricating substance, may be used in the construction of t-he bushing. The outer surface of the bushing is formed to fit the walls of the orifice, in this particular case the bushing being substantially square in cross section to fit the correspondingly shaped orifice in the hub of the sheave. lt will be understood, however, that Whenever the form of the orifice is changed, the shape of the bushing may be correspondingly altered so that it will fit snugly within the orifice and the comparatively sharp edges of the recess in theV hub will tend to dig into the surface of the bushthe bore of said bushing and whereon said bushing and sheave are adapted to turn freely, the inner wall of said hub around said orifice having a. groove or recess formed therein intermediate to the ends of the orilice and extending through a substantial portion of the inner surface of said hub, said ing and hold it against premature movement in the orifice.v Y

A considerable gap will be formed between the bottom of the recess and the wall of the bushing' which will allow expansion of the bushing underV certain conditions, and when the wall of the bushing has become expanded within the recess, it is evident that the bushingY will be firmly locked against movement in either direction in the orifice, and this locking eHect, due to the expansion of the bushing in the recess, will positively prevent endwise movement of the bushing, and as the ends of the bushing project outwardly on each side beyond the wall of the sheavev Y and contact with the inner surface of the housing, 1t is evident that there can be no contact of metal upon metal in the operation of the pulley and hence the movement of the sheave inraising and lowering a. window, will -be substantially noiseless.

with the lubricant impregnated ends of the I Vbushing contacting with the inner faces of the housing and producing a dead, muffled sound, if any sound at all, instead of the usual metallic click that accompanies the contact ofl one piece of metal with another.

' Ve claim as our invention:

A sash pulley comprising a housing, a

sheave having a hub fitting within said'hous-Y ing and provided with an orifice, azbjushing of fibrous material fitting within said orifice and having a bore therethrough, a member mounted in said housing and passing through 

